Dynamic Testing - Vehicle Running
Dynamic Testing-Vehicle RunningDynamic testing is the final step in the transmission tester usage. It allows the transaxle to be proven out electronically and hydraulically.
Transaxle Solenoid Cycling and Drive Test Procedures Preliminary setup
1. Bench/Drive switch set to DRIVE mode.
2. Rotate gear select switch on tester to GEAR SELECT "1" position.
3. Vehicle in PARK.
4. Start vehicle.
EPC solenoid
Caution: Do not attempt to hold the EPC switch depressed (minimum line pressure) and stall the transaxle (holding the vehicle with the brake while depressing the throttle with the transaxle in gear), transaxle damage will result.
5. Observe line pressure. Record value. Line pressure should go to maximum. If not, refer to Diagnosis By Symptom or Pinpoint test "E" concerning EPC solenoid.
6. Depress EPC switch. Line pressure should drop to a minimum value. Record value. If not, refer to Diagnosis By Symptom or Pinpoint Test "E".
Engagement
Note: For reverse operation gear select switch must be in "3/R".
7. Set Bench/Drive switch is in the "DRIVE" mode.
8. Rotate gear select switch to GEAR SELECT "1".
9. Start vehicle, rotate gear select switch to GEAR SELECT and depress EPC switch. Line pressure should drop to idle pressure. While holding the EPC switch down, shift vehicle from PARK to REVERSE.
^ Does vehicle shift into REVERSE?
^ Was engagement smooth?
Shift vehicle from REVERSE to PARK.
10. Rotate gear select switch to GEAR SELECT "1". Depress EPC switch. Line pressure should drop to idle pressure. While holding the EPC switch down, shift vehicle from PARK to DRIVE.
^ Does vehicle shift into DRIVE?
^ Was engagement smooth?
Shift vehicle from DRIVE to PARK. Release the EPC switch, pressure should return to maximum. Repeat step 9 and 10 for engagements, with the EPC switch released engagements should be firm.
Upshift/Downshift
Note: GEAR SELECT SWITCH must be in GEAR SELECT "3/R" to get REVERSE gear. Upshifts and downshifts will be FIRM during this procedure. Pressure gauges may be removed from vehicle during these tests. These tests should be performed on the road. If performed on the hoist the technician may not feel all of the shifts when they are engaged. LED's will turn "green" when solenoids are activated and turn "off" when deactivated. Refer to the appropriate overlay for the proper status/shift sequence of the shift solenoids during upshift and downshift.
Caution: Selector lever must be in the D range positon or Internal damage could result. Do not shift to S or L range position.
11. Verify that the gear select switch is in 1st gear position. Move the selector lever into the D range. Depress the 3-2 T/CCS button and accelerate the vehicle. If there is no vehicle movement, inspect the forward one-way clutch. If movement occurs proceed to step 12 and continue diagnosis.
12. Verify that the gear select switch is in "1" position. Move the selector shift lever into D range and accelerate to 25 km/h (15 mph), select 2nd gear by rotating the gear selector to "2" position.
^ Did the vehicle upshift to 2nd gear?
^ Did the appropriate shift solenoids activate/deactivate?
13. Accelerate to 40 km/h (25 mph) and select "3" position.
^ Did the vehicle upshift to third gear?
^ Did the appropriate shift solenoids activate/deactivate?
14. Accelerate to 56-72 km/h (35-45 mph) and select "4" position.
^ Did the vehicle upshift to fourth gear?
^ Did the appropriate shift solenoids activate/deactivate?
Caution: The vehicle must be below 56 km/h (35 mph) before selecting gear select "1" position, or the transaxle could overrun.
15. Reverse the order to downshift.
Note: 4-3 downshift will be harsh using transmission tester.
^ Does the vehicle down shift from forth gear to third gear, third gear to 2nd gear and 2nd gear to 1st gear. Did the appropriate shift solenoids activate/deactivate?
Torque converter clutch (TCC) engagement
Note: This test should be performed on the road. If performed on a hoist the technician may not feel the torque convener clutch engage.
Caution: Do not depress TCC switch with transaxle in gear and the vehicle at a stop. Damage to converter clutch may result.
16. Accelerate and shift vehicle up into third gear. Hold speed steady and depress the TCC switch.
^ Does the converter engage?
^ Does the engine rpm drop?
^ Did the TCC solenoid activate?
3-2 Timing/Coasting clutch (3-2T/CCS) Engagement
Note: This test should be performed on the road. It performed on the hoist the technician may not feel the 3-2 timing/coasting clutching disengage.
17. Accelerate and upshift the vehicle into 2nd gear. Go to closed throttle. Depress the 3-2T/CCS switch.
^ Does the 3-2 timing/coasting clutch disengage?
^ Did the 3-2T/CCS solenoid deactivate (light on)?
18. Remain at closed throttle, then release 3-2T/CCS switch.
^ Does the 3-2 timing/coasting clutch engage?
^ Did the 3-2 T/CCS solenoid activate (light off)? Does engine braking occur when the throttle is released?
Turbine Shaft Speed Sensor Function Check
Note: This test may be performed on the hoist or on the road.
19. Set voltmeter to 20 volts A.C. Connect voltmeter positive lead to the (+) TSS jack. Connect voltmeter negative lead to the (-) TSS jack. Slowly accelerate vehicle and monitor voltmeter.
^ Does the voltage increase with vehicle speed?